<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    * {
      margin: 0;
      padding: 0;
    }

    ul {
      margin: 100px auto;
      display: flex;
      /* 设置子元素方向 */
      /* flex-direction: row; */
      /* 换行方式 */
      /* flex-wrap: wrap; */
      /* 子元素方向和换行方式 */
      flex-flow: row nowrap;
      /* 主轴对象 */
      /* justify-content: space-between; */
      /* 副轴|交叉轴 */
      align-items: center;
      /* 多轴对齐 */
      /* align-content: flex-end; */
      list-style: none;
      width: 800px;
      height: 600px;
      background-color: skyblue;

    }

    li {

      width: 400px;
      height: 100px;
      background-color: pink;
      border: 1px solid #fff;
    }

    li:nth-child(2) {
      /* font-size: 40px; */
    }

    .item1 {
      /* flex: 1 1 auto; */
      /* flex-grow: 1; */
      /* flex-shrink: 1; */
    }

    .item2 {
      /* flex: 2 2 auto; */
      /* flex-grow: 2; */
      /* flex-shrink: 2; */
      flex-basis: 800px;
    }

    .item3 {
      /* flex: 3 3 auto; */
      flex-basis: 150px;
      /* flex-grow: 1; */
      /* flex-shrink: 1; */
      /* order: 0; */
      /* align-self: flex-end; */
    }
  </style>
</head>

<body>

  <ul>
    <li class="item1">1</li>
    <li class="item2">2</li>
    <li class="item3">3</li>
    <!-- <li class="item4">4</li>
    <li class="item5">5</li>
    <li class="item6">6</li>
    <li class="item7">7</li>
    <li class="item8">8</li>
    <li class="item9">9</li>
    <li class="item10">10</li>
    <li class="item11">11</li>
    <li class="item12">12</li>
    <li class="item13">13</li>
    <li class="item14">14</li>
    <li class="item15">15</li>
    <li class="item16">16</li> -->
  </ul>
</body>

</html>